Designed for groups of 25 or less, this tour is focused on Gaudi and his designs that made Barcelona the capital of modernist architecture. Two magnificent examples of his work can be found on Passeig de Gràcia, known as the "Block of Discord." Outside, his La Pedrera is built entirely of natural stones that appear like rolling waves and adorned with iron Art Nouveau balconies. Point your camera to the rooftop, crowned with large surrealist chimneys. Step inside the UNESCO World Heritage Site and find Gaudi-designed furnishing and fittings including door knobs, ceiling moldings and floors. Nearby sits Casa Batlló, another UNESCO site. Known locally as the "House of Bones," due to its skeletal appearance, this breathtaking building features irregular oval windows, intricate mosaics, sculpted stonework, and an arched roof reminiscent of the back of a dragon with scales that appear to change colors as you walk past them.